634397130840 has 128 divisors (see below), whose sum is σ = 2084824811520. Its totient is φ = 153155020800.

The previous prime is 634397130839. The next prime is 634397130841. The reversal of 634397130840 is 48031793436.

It is an interprime number because it is at equal distance from previous prime (634397130839) and next prime (634397130841).

It is a self number, because there is not a number n which added to its sum of digits gives 634397130840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634397130841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 678984 + ... + 1315223.

It is an arithmetic number, because the mean of its divisors is an integer number (16287693840).

Almost surely, 2^634397130840 is an apocalyptic number.

634397130840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634397130840 is an abundant number, since it is smaller than the sum of its proper divisors (1450427680680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634397130840 is a wasteful number, since it uses less digits than its factorization.

634397130840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994473 (or 1994469 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 634397130840 in words is "six hundred thirty-four billion, three hundred ninety-seven million, one hundred thirty thousand, eight hundred forty".